Details
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Type:
Bug
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Status:
Closed
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Priority:
Major
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Resolution: Fixed
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Affects Version/s: 1.2.2
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Fix Version/s: 1.3.1
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Component/s: None
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Labels:None
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JDK version and platform:Sun 1.6.0_03-b05 for Windows
Description
Why can't I use "class" as an attribute name? Whenever I tried, an exception is thrown. Is this a bug or am I doing something wrong here? Please see the code below.
import com.thoughtworks.xstream.XStream;
import com.thoughtworks.xstream.converters.SingleValueConverter;
public class Software {
private static class AttributeConverter implements SingleValueConverter {
@SuppressWarnings("unchecked")
@Override
public boolean canConvert(Class type)
@Override
public String toString(Object obj)
@Override
public Object fromString(String name)
}
private static class Attribute {
public String value;
public Attribute(String value)
{ this.value = value; }}
public Attribute clazz;
public static void main(String[] args)
{ String xml = "<software id=\"test\"/>"; // Using "id" as an attribute is fine, // String xml = "<software class=\"test\"/>"; // but using "class" won't work!! XStream xstream = new XStream(); xstream.alias("software", Software.class); xstream.aliasAttribute("id", "clazz"); // Using "id" as an alias is fine, //xstream.aliasAttribute("class", "clazz"); // but using "class" won't work!! xstream.useAttributeFor("clazz", Attribute.class); xstream.registerConverter(new AttributeConverter()); Software sw = (Software) xstream.fromXML(xml); System.out.println(xstream.toXML(sw)); }}
Issue Links
- is duplicated by
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XSTR-520
XML with attribute call 'reference'
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Activity
"class" is an internally used attribute and there's currently no real way to use it for your own purpose, sorry. Any further questions please go to the user's list.
Jörg Schaible
added a comment - "class" is an internally used attribute and there's currently no real way to use it for your own purpose, sorry. Any further questions please go to the user's list. Just one more question before I try the user's list. As part of my system integration project requirement, I need to parse some XML documents that have some tags with "class" as the attribute name, and I also need to create some XML documents with some tags with "class" as the attribute name as well. Do you have any idea how I can get around this problem?
Don Ngo
added a comment - Just one more question before I try the user's list. As part of my system integration project requirement, I need to parse some XML documents that have some tags with "class" as the attribute name, and I also need to create some XML documents with some tags with "class" as the attribute name as well. Do you have any idea how I can get around this problem? Next version of XStream will have a method XStream.aliasSystemAttribute that allows you to tell XStream to use another name without side effects.
Jörg Schaible
added a comment - Next version of XStream will have a method XStream.aliasSystemAttribute that allows you to tell XStream to use another name without side effects. Set correct fix version.
Jörg Schaible
added a comment - Set correct fix version. Fixed for upcoming release.
Jörg Schaible
added a comment - Fixed for upcoming release. 
Strangely, even when I tried using customed converter to get around this problem, it still doesn't work.
import com.thoughtworks.xstream.XStream;
import com.thoughtworks.xstream.converters.Converter;
import com.thoughtworks.xstream.converters.MarshallingContext;
import com.thoughtworks.xstream.converters.UnmarshallingContext;
import com.thoughtworks.xstream.io.HierarchicalStreamReader;
import com.thoughtworks.xstream.io.HierarchicalStreamWriter;
public class Software {
// Setting ALIAS to "class" will result in run-time exception
private static final String ALIAS = "xyz";
public String clazz;
private static class MyConverter implements Converter {
{ return clazz.equals(Software.class); }@SuppressWarnings("unchecked")
@Override
public boolean canConvert(Class clazz)
@Override
{ Software custom = (Software) source; if (custom.clazz != null) writer.addAttribute(ALIAS, custom.clazz); }public void marshal(Object source, HierarchicalStreamWriter writer,
MarshallingContext context)
@Override
{ Software custom = new Software(); custom.clazz = reader.getAttribute(ALIAS); return custom; }public Object unmarshal(HierarchicalStreamReader reader,
UnmarshallingContext context)
}
public static void main(String[] args)
{ String xml = "<software " + ALIAS + "=\"test\"/>"; XStream xstream = new XStream(); xstream.alias("software", Software.class); xstream.aliasAttribute(ALIAS, "clazz"); xstream.registerConverter(new MyConverter()); Software sw = (Software) xstream.fromXML(xml); System.out.println("before: " + xml); System.out.println("after : " + xstream.toXML(sw)); }}